How to Add Field-Level Annotations using OpenAPI Generator?

How can I add annotations at the field level using OpenAPI Generator?

@Schema(description = "Field description here")
private String exampleField;

OpenAPI Generator enables developers to create API clients and server stubs from OpenAPI specifications. One way to enrich the API documentation is by adding annotations at the field level in your model classes. This guide explains how to effectively implement field-level annotations to provide clearer documentation and improve the usability of your API.

import io.swagger.v3.oas.annotations.media.Schema;

public class ExampleModel {
    @Schema(description = "An example field that holds a string value.", example = "Sample Value")
    private String exampleField;

    // Getter and Setter
    public String getExampleField() {
        return exampleField;
    }

    public void setExampleField(String exampleField) {
        this.exampleField = exampleField;
    }
}

Causes

• Lack of detailed descriptions for individual fields in API documentation.
• Difficulty in understanding API responses without clear annotations.

Solutions

• Use the `@Schema` annotation provided by libraries like Swagger to describe fields in detail.
• Add validation constraints and examples to enhance documentation.

Mistake: Not using the correct import for the annotation.

Solution: Ensure you import `io.swagger.v3.oas.annotations.media.Schema`.

Mistake: Overlooking default constructor requirement for model classes.

Solution: Always include a default constructor for your model classes when using OpenAPI.